tree 2e0f07c50b96ffac4dea47ddc3d381c9f50277f0
parent bf39b0f7338464a47c4181d3ca879edc09e14ee5
author Dave Borowitz <dborowitz@google.com> 1527097292 -0400
committer Dave Borowitz <dborowitz@google.com> 1527162346 -0400

ChangeKindCacheImpl: Don't use reference equality for trees

It is basically an implementation detail of the JGit RevWalk machinery
that the getTree() methods for two RevCommits from the same RevWalk
return the same RevTree instance. Although it may be a documented and
stable detail, the code is easier to reason about if we don't depend on
it. This particular code is in a cache loader, where we are certainly
not sensitive to the performance difference between == and
Objects#equals.

Change-Id: I7ae66ac80c1344560543692f6631f469f038c979